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STATUS_HV_PROCESSOR_STARTUP_TIMEOUT
A processor did not complete the expected Hyper-V startup transition
STATUS_HV_PROCESSOR_STARTUP_TIMEOUT points to a processor-startup synchronization problem. It can appear when Hyper-V is bringing processors into the state needed to run the hypervisor or a partition and one processor does not respond within the expected interval.
Diagnose it as a host or virtualization-layer startup problem, not as a normal guest application crash. Firmware settings, microcode, power-management behavior, CPU hot-plug state, or nested virtualization can all affect whether a processor reaches the required state in time.
What to collect
- The processor or CPU group involved, if the log identifies it.
- Recent firmware, BIOS, microcode, hypervisor, or CPU-topology changes.
- Whether the failure occurs on cold boot, resume, VM start, restore, or only under load.
- Host system events around Machine Check, WHEA, CPU offline/online, and power-state transitions.
Useful distinction
This is not the same as an invalid VP index. A virtual processor can be correctly named while a physical or logical processor needed by the hypervisor fails to complete its startup transition.
References
- Microsoft: Hyper-V architecture
- Microsoft: Hyper-V TLFS
- Linux kernel documentation: Hyper-V overview
- Microsoft Open Specifications: NTSTATUS values
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